What was happening is that $localization_file_content was set to http://api.prestashop.com/download/localization/15/us.xml, however that file did not exist. At the time of this writing, that URL was resulting in a 404 error. To resolve this issue, we added the following line in install/models/install.php:

The unset function deleted the variable, and therefore ran the following code, which creates the contents based upon files already stored within PrestaShop 1.5 (instead of trying to download them from api.prestashop.com - which is resulting in a 404 error)

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An error occurred during installation...

Have you tried going back to the previous step and then retrying? Does it do the same? Are there any other issues with the install? Error messages? Have you tried this on a completely clean folder structure or are you trying to overwrite some files? Which specific version are you trying to install?